Heat exchanger

ABSTRACT

Heat exchangers of generally cylindrical shape, including structure having at least two chambers being wound on themselves in self-enclosing spirals, baffles forming passageways through said chambers to facilitate the flow of heat-exchanging media through said chambers in alternate centripetal and centrifugal relationship.

United States Patent [191 J ouet et al.

[ Dec. 17, 1974 HEAT EXCHANGER [76] Inventors: Etienne Jouet, 19 Rue du Panorama,

95 Montigny-les-Cormeilles; Pascal Rebuffe, 18 Rue de Sevres, Boulonge-Billancourt, both of France [22] Filed: Sept. 20, 1972 [21] Appl. No.: 290,518

Related US. Application Data [62] Division of Ser. No. 888,591, Dec. 29, 1969.

[52] US. Cl. 165/163 [51] Int. Cl F28f 3/00 [58] Field of Search 165/166, 163, 164

[56] References Cited UNITED STATES PATENTS 3,543,844 12/1970 Jordan 165/166 Primary Examiner-Charles Sukalo Attorney, Agent, or FirmWaters, Roditi, Schwartz & Nissen 57] ABSTRACT Heat exchangers of generally cylindrical shape, including structure having at least two chambers being wound on themselves in self-enclosing spirals, baffles forming passageways through said chambers to facilitate the flow of heat-exchanging mediathrough said chambers in alternate centripetal and centrifugal relationship. I

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1. A heat exchanger of generally cylindrical form acting between two fluids, comprising: a. first and second chambers wound in juxtaposed and enclosing spirals; and a thin metal wall separating said chambers from each other, said metal wall having gofferings formed thereon and abutting against the wall of an adjacent chamber; b. a central cylindrical tube, said chambers spirally encompassing said tube, fluid inlet and outlet means for said second chamber being formed by said tube; c. an external cylindrical hoop concentrically encompassing said central tube and forming an annular space therebetween, said hoop and tube forming the supporting framework of said heat exchanger, said chambers being located in said annular space between said hoop and said tube, and said external cylindrical hoop axially extending beyond the level of said spirally coiled chambers; d. closure caps attached to said cylindrical hoop so as to form two enclosures, said enclosures being in direct communication with said first chamber through the open lateral ends thereof and forming respectively inlets and outlets to said first chamber; e. obturation means dividing into two portions forming, respectively, a distribution portion and a collector portion, said second chamber communicating with the distribution portion at its central portion and with the collector portion at the other end thereof; f. and guide means being positioned within said second spirally coiled chamber and adapted to guide the fluid in said chamber to flow therealong in a centrifugal direction from the distribution portion of the tube substantially to the periphery of said chamber, and in a centripetal direction from the periphery of said chamber to the collector portion of said tube.
 2. A heat exchanger as claimed in claim 1, said gofferings being bosses formed in said thin metal wall.
 3. A heat exchanger as claimed in claim 1, said guide means being in the form of partitioning means internally following the spiralled shape of the second chamber and arranged in a plane extending perpendicular to the axis of the central tube, said partitioning means being discontinuous in the region of the outer periphery of the coiled chamber so as to divide said second chamber into lower and upper portions and forming a passage between the two portions of said chamber.
 4. A heat exchanger as claimed in claim 1, the walls of said second chamber being formed of goffered metal sheets having corrugations impressed thereon, and spaced at a proximity so as to cause the fluid flowing through said second chamber to be distributed equally throughout the space of said chamber.
 5. A heat exchanger as claimed in claim 1, said first chamber comprising a spiral partition extending in a plane perpendicular to the axis of the hoop, said partition haviNg an aperture therein, and two lateral, spiral shaped sides forming closure means having an aperture in the radially inner portion thereof, said closure means and said partition forming guide means causing the fluid to flow in a path spiralling first in a centrifugal direction and then in a centripetal direction in countercurrent flow to the fluid flowing in said second chamber.
 6. A heat exchanger as claimed in claim 5 the walls of the second chamber being made of a goffered metal.
 7. A heat exchanger as claimed in claim 1, comprising a jacket made of a metal foil wound about said spirally coiled chambers, and a packing of moldable substance poured between said hoop and the outer wall of the jacket filling the interstitial space between the outer wall and said hoop, said packing eliminating the spiralled chambers to be exactly ajusted to the dimensions of the hoop and facilitating the pressure inside the chambers to be absorbed both by the hoop and the central tube.
 8. A heat exchanger as claimed in claim 1, comprising a first cylindrical tube, said chambers spirally encompassing said tube, an internal secondary tube contained in said first tube, the first chamber being in communication with the annular section of the first cylindrical tube at one end and with the secondary internal tube at the other end thereof, said annular section and said secondary internal tube forming, respectively, an entry and an exit for a fluid passing through said first chamber, and both concentric tubes comprising respectively an inlet and outlet disposed on the same sectional face of the heat exchanger. 